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Fix an error in common-prefix calculation

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This commit is contained in:
dmiller
2018-10-31 23:44:52 +00:00
parent 625884e7dc
commit 0f916ec3bc
1 changed files with 5 additions and 1 deletions
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6
nbase/nbase_addrset.c
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@@ -239,6 +239,10 @@ u32 common_mask(u32 a, u32 b)
u8 r; // r will be lg(v) u8 r; // r will be lg(v)
u32 t, tt; // temporaries u32 t, tt; // temporaries
u32 v = a ^ b; u32 v = a ^ b;
if (v == 0) {
/* values are equal, all bits are the same */
return 0xffffffff;
}
if ((tt = v >> 16)) if ((tt = v >> 16))
{ {
@@ -250,7 +254,7 @@ u32 common_mask(u32 a, u32 b)
} }
if (r + 1 >= 32) { if (r + 1 >= 32) {
/* shifting this many bits would overflow. Just return max mask */ /* shifting this many bits would overflow. Just return max mask */
return 0xffffffff; return 0;
} }
else { else {
return ~((1 << (r + 1)) - 1); return ~((1 << (r + 1)) - 1);